Inking apparatus of printing machines



Oct. 29, 1929. 0, BLACK 1,733,716

INKING APPARATUS 0F PRINTING MACHINES Filgd Nov. 26, 1927 Patented Oct.29, 1929 UNITED STATES HORACE DRUMMOND BLACK, OF LONDON,ENGLAIQ'IDQASSIGNOR TO THE BELLIPUITCH 8c PRINTING CO. LIMITED, 01?UXBBIDGE, MIDDLESEX, ENGLAND INKING APPARATUS 0F PRIN TING MACHINESApplication filed November 26, 1927, Serial No. 235,857, and in GreatBritain December 10, 1926.

This invention relates to improvements in the inking apparatus ofprinting machines such as combined ticket printing and issuing machinesin which the process of distribution of the ink and the linking of theplaten has of necessity to be in as simple a form as possible owing tolack of space.

The method employed in the ordinary form of printing machine of breakingup and distributing the ink through the medium of a number ofcomposition rollers, some of which are provided with a lateraloscillating movement inorder to obtain the fine distribution necessaryin the ordinary form of printing, isincapable of application to thesemachines owing to limitations of space.

The method employed of conveying the ink from the ink duct to the typeface by means of one or more rollers has hitherto only yieldedcomparatively poor results and the object of my invention is to providemeans for improving the inking effect obtained by the above means. Tothis end, according to the invention, I arrange the inking roller andthe ink duct roller which are formed of or coated with the usualresilient composition and are of comparatively short length, in such amanner that they contact obliquely with one another, the effect of thisoblique contact giving to the inking roller a somewhat similardistribution to that ob tained with the lateral oscillating rollerin theordinary form of inking train.

i I am awarethat in a machine for manufacturing and printing cigarettetubes in which an intermediate roller is arranged between the ink ductroller and the distributing roller, it has been proposed to mount suchintermediate roller on an axis at an angle to the printing cylinder'axis which arrangement occupies more space than can conveniently beprovided in printing machines of the type to which my invention isapplied.

In a suitable arrangement for carrying out the invention, the inkingroller is carried on a pivot beneath the fixed revolving ink ductroller,.the movement of the said inking roller being controlled by acam, secured to the shaft of the platen or printing cylinder,androtating therewith, which op erates one end of a bell-crank lever,the free end of the inking roller shaft being carried in a slot providedinthe other end of. the said bell-crank lever. i I The method ofoperationiis as follows Normally, the inking roller is in obliquefrictional, contact with the ink duct roller 7 and revolves therewith.The cam secured to the shaft of the printing cylinders bears against theend of the bell-crank lever during rotation and forces it downwards,thus drawing the inking roller, carried in the slot in the end thereof,into contact with the said printing cylinder. 1 This contact ismaintained until the bearing surface ofthe cam is rotated out of contactwith the said lever, when the lever is returned to its normal positionby means of a spring. i I

In order that the invention may be fully understood, I will now describeit by reference to the accompanying drawings, in which c Figure 1 is asectional elevation of one method of applying the inventiomand Figure 2is a plan view thereof.

a is the inkduct roller, revolving on its spindle b, and c is the inkreservoir. d is the inking roller which revolves on the spin dle e,normally arranged obliquely to the spindle 6. One end of this spindle eis pivoted at f to the framing of the device and the other end thereofrides in a slot f of the framing.

g isthe printing cylinder carrying type tobe inked and which is mountedon thespindle h. j is the cam secured to the said spindle h andrevolving therewith and 7c is the bells crank lever, in a slot Z in oneend of which the free end of the spindle e engages, and which is pivotedat m and carries at its other end the roller it against which'the cam jbears to bring the inking roller cl into contact with theprinting-cylinder g. p is the spring provide d for returning the saidroller 61 to its normal position. 7

1 The operation of follows i I The roller cl is normally held by thespring the arrangement is as p in oblique frictionalcontact with theroller f a, as shown by the dotted lines in Figures 1 and 2. As thecylinder 9 rotates the cam j depresses the bell-crank lever is therebyswingingthe inking roller d on its pivot ,7 out of contact with theroller a and into contact with the printing cylinder 9 This contact ismaintained until the bearing surface of the cam j is rotated out ofcontact With the said lever: is when the roller (Z is'automaticallyreturned to its normal position by the spring It will beunderstoodthatas the rolls a and (Z are formed of, or coated with. the usualresilient composition, and are of comparatively short length, surfacecontact over their entire length is ensured.

Claimsz:

1. An inking device for printing machines, comprising a printingcylinder, an ink duct roller and an inking roller, said rollers being somounted Withrespect to one another that an oblique contact is obtained,and means for oscillating one, of said rollers to b ring the same out;of engagement with the other, andxinto parallelengagement with saidcylinder; 1

2; In a ticket printing and issuingmachine, a: printing cylinder, an inkduct roller, an inking roller, mechanism synchronized with the rotationof said, printing cylinder for causing said inking roller toalternately'engagesaid inkw onct roller in: oblique contact, and: saidprinting cylinder inrpa'rallel con-- Y tact.

3. i-kllllllill'l'g' device for printing machines, comprising a printingcylinder: mounted on a; shaft, an ink duct roller and an inkingrollerythe latter being mounted on a shaft pivoted: at one end, a bell;crank lever slotted at one: end to receive the tree endv of said pivotedshaft, and a cam mounted on; said. printing cylinder shaft and revolvingtherewith tonoperat-ing' the opposite end of said bell-crank lever, saidrollers being so mounted with respect to-one' another that when saidbelliorank lever is in operation, the roller mounted onsaid?p1votedshaftwill be oscillatedand intermittently brought intooblique contact with the other roller.

HORACE DRUE MOND BLACIQ

